update

cmd/cart/pool-server.go

@@ -19,6 +19,7 @@ import (
 	"github.com/matst80/go-redis-inventory/pkg/inventory"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/redis/go-redis/v9"
 	"go.opentelemetry.io/contrib/bridges/otelslog"
 	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 	"google.golang.org/protobuf/types/known/anypb"
@@ -47,13 +48,24 @@ type PoolServer struct {
 	inventoryService inventory.InventoryService
 }
 
-func NewPoolServer(pool actor.GrainPool[*cart.CartGrain], pod_name string, klarnaClient *KlarnaClient, inventoryService inventory.InventoryService) *PoolServer {
-	return &PoolServer{
+func NewPoolServer(pool actor.GrainPool[*cart.CartGrain], pod_name string, klarnaClient *KlarnaClient, inventoryService inventory.InventoryService, inventoryRedisClient *redis.Client) *PoolServer {
+	srv := &PoolServer{
 		GrainPool:        pool,
 		pod_name:         pod_name,
 		klarnaClient:     klarnaClient,
 		inventoryService: inventoryService,
 	}
+	inventory.NewInventoryChangeListener(inventoryRedisClient, func(ctx context.Context, sku inventory.SKU, locationID inventory.LocationID) {
+		qty, err := inventoryService.GetInventory(ctx, sku, locationID)
+		if err != nil {
+			log.Printf("error fetching inventory for sku %s at location %s: %v", sku, locationID, err)
+		}
+		srv.GrainPool.GetPubSub().Publish(actor.Event{
+			Topic:   fmt.Sprintf("inventory:%s:%s", sku, locationID),
+			Payload: qty,
+		})
+	})
+	return srv
 }
 
 func (s *PoolServer) ApplyLocal(ctx context.Context, id cart.CartId, mutation ...proto.Message) (*actor.MutationResult[*cart.CartGrain], error) {